How To Convert PDF to Word Online?
Easy-to-use PDF software
Why are there formatting issues when converting a PDF to Word?
Unfortunately if your intention is to just CTRL+C and CTRL+V, it won't work. As other answers have clearly elaborated, you will need to find and install a 3rd party software that is capable of doing this. Alternatively, you can also find websites that will convert the documents. You will just need to upload the file onto said site. Considering these are short stories you wish to compile, I assume it shouldn't be a problem. I'd be wary of uploading any sensitive information. A quick Google search should help you with the software/website you need.
Convert PDF to Word: All You Need to Know
If these techniques do not work, then hopefully this article will give you an idea what should be undertaken in order to upload the story to an e-reading platform.
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